在Powershell中，如何将二进制文件重定向到标准输入？

Question

这不适用于二进制文件：Redirecting standard input\output in Windows Powershell

以下是我用于输入的内容的摘要。您可以看到 ls 显示文件大小为 858320 字节，但是当通过 Get-Content 进行管道传输时，情况并非如此。

PS C:\Users\Joseph\Documents\GitHub\java_hprof_to_txt> ls .\generate_hprof\heap.dump.hprof


    Directory: C:\Users\Joseph\Documents\GitHub\java_hprof_to_txt\generate_hprof


Mode                LastWriteTime         Length Name
----                -------------         ------ ----
-a----        1/28/2017  12:02 PM         858320 heap.dump.hprof

这是我的最小测试程序，它计算标准输入中的字节数，直到达到 eof：

#include <stdio.h>  
#include <fcntl.h>  
#include <io.h> 


int main()
{
    char buff;
    int numOfBytesRead;
    int dataLen = 0;

    #ifdef _WIN32
    int result = _setmode(_fileno(stdin), _O_BINARY);
    if (result == -1)
        perror("Cannot set mode");
    else
        printf("'stdin' successfully changed to binary mode\n");
    #endif

    while (true) {
        numOfBytesRead = fread(&buff, 1, 1, stdin);
        if (numOfBytesRead != 1) {
            if (feof(stdin)) {
                fprintf(stdout, "end of file reached\n");
            }
            int errorCode = ferror(stdin);
            if (errorCode) {
                fprintf(stdout, "error reading file %d\n", errorCode);
            }
            perror("The following error occurred:");
            break;
        }
        dataLen++;
    }
    fprintf(stdout, "read %d bytes\n", dataLen);
    return 0;
}

这是输出。请注意，字节与 ls 不匹配。

PS C:\Users\Joseph\Documents\GitHub\java_hprof_to_txt> Get-Content .\generate_hprof\heap.dump.hprof | .\x64\Debug\CountBytes.exe
'stdin' successfully changed to binary mode
end of file reached
The following error occurred:: No error
read 860183 bytes

我什至尝试过 -Encoding Byte 和 -Encoding Unknown 但这没有帮助：

PS C:\Users\Joseph\Documents\GitHub\java_hprof_to_txt> Get-Content -Encoding Byte  .\generate_hprof\heap.dump.hprof | .\x64\Debug\CountBytes.exe
'stdin' successfully changed to binary mode
end of file reached
The following error occurred:: No error
read 3253650 bytes

PS C:\Users\Joseph\Documents\GitHub\java_hprof_to_txt> Get-Content -Encoding Unknown  .\generate_hprof\heap.dump.hprof | .\x64\Debug\CountBytes.exe
'stdin' successfully changed to binary mode
end of file reached
The following error occurred:: No error
read 429608 bytes

当我在普通命令终端中运行它时，它工作正常：

C:\Users\Joseph\Documents\GitHub\java_hprof_to_txt>.\x64\Debug\CountBytes.exe <  .\generate_hprof\heap.dump.hprof
'stdin' successfully changed to binary mode
end of file reached
The following error occurred:: No error
read 858320 bytes

Answer 1

如果添加参数-Raw没有帮助：

Get-Content .\generate_hprof\heap.dump.hprof -Raw | .\x64\Debug\CountBytes.exe

使用Start-Processcmdlet 肯定会起作用：

Start-Process .\x64\Debug\CountBytes.exe -RedirectStandardInput .\generate_hprof\heap.dump.hprof